The correct answer is C: about. The noun 'discussion' is followed by the preposition 'about' when referring to the topic of discussion. 'A discussion about the project' is the standard usage.
A.beneath
B.with
C.about✓ Correct
D.in
Explanation
The noun 'discussion' is followed by the preposition 'about' when referring to the topic of discussion. 'A discussion about the project' is the standard usage.
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